Air-charging pump for sprayers



H. E. BRANDT. AIR CHARGING PUMP FOR SPRAYEHS. APPLICATION FILED AUG.23, I920.-

1,395,086 Patented Oct. 25, 1921.

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UNITED STATES PATENT OFFICE.

HENRY E. BRANDT, OF NORTH ST. PAUL, MINNESOTA, ASSIGNOR TO DOBBINS MANU- FACTURING COMPANY, OF NORTH ST. PAUL, -MINNESOTA, A CORPORATION OF SOUTH DAKOTA.

Specification of Letters Patent.

Patented Oct. 25, 1921.

Application filed August 23, 1920. Serial No. 405,338.

To all whom it may concern:

Be it known that I, HENRY E. BRANDT, a citizen of the United States, residing at North St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Air- Charging Pumps for Sprayers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an improved air-charging pump for sprayers of the kind wherein the poisonous liquid is carried in a suitable receptacle and charged with air under pressure to secure the spraying action through a valve-controlled spraying nozzle; and, to this end, my invention consists of the novel devices and combinations of devices hereinafter described and pointed out in the claims. I

In the drawings, wherein like notations refer to like parts throughout the several views,

Figure 1 is a view, partly in elevation and partly in vertical section, showing the sprayer of the type above noted and having my improved pump embodied therein;

Fig. 2 is a view on a larger scale, partly in side elevation and partly in vertical section, showing the lower end of the pump cylinder and plunger and my improved valve mechanism detached from the liquid receptacle of the sprayer Fig. 3 is a bottom plan view of the parts shown in Fig. 2;

Fig. 4 is a perspective view of certain details, to wit: portions of the pump cylinder and the valve-supporting spring cross bar showing the cooperating lugs by which these elements are separately secured together; and

Fig. 5 is a sectional view of the lower end portion of a pump cylinder having a modified form of valve for controlling the air outlet.

The numeral 6 represents a liquid receptacle suitable for containing the poisonous mixture and a charge of air under pressure. The numerals 7, Sand 9 represent, respectively, in the order named, the section of discharge pipe located within the cylinder 6, a flexible hose section connected to the upper end of the section 7, in the usual way, and

the numeral 9 the customary valve-controlled'spraying nozzle connected to the free end of the hose section 8.

The numeral 10 represents a pump cylinder having its bottom wall 11 set inward of its lower or discharge end and provided with a centrally located air discharge passage 12. I prefer to have this bottom 11 slightly crowned with its convex surface upward and to have the air passage 12 stamped out through the crown so that the passage will have a flanged wall projecting downward and outward below the outer face of the bottom at its central portion, as shown in Fig. 2. The numeral 13 represents a disk-like valve ofsuitable material for controlling the discharge passage 12, and, as shown in the main views, this valve 13 is centrall pinned to a spring cross bar 1& which carries the same, and, when in working position, holds the valve 13 with its face pressed tightly under spring pressure against the projecting mouth wall of the passage 12, as shown in Fig. 2. The said spring cross bar let is provided with a pair of lugs 15, at each end, spaced apart from each other and projecting downward, when the bar is right side up in working position; and that portion of the pump cylinder 10, which projects downward and outward beyond the bottom 11, is provided with a pair of horizontally disposed lugs 16, at diametrically oppositepoints, in position to be engaged by the lugs 15 of the cross bar 14, by springing the ends of the cross bar when the said cooperating lugs are in registration with each other, thereby separably locking my improved valve mechanism in its proper working position, as shown in Figs. 1, 2 and 3.

The lugs 15 on the ends of the cross bar 14 are conveniently formed by stamping the same up from the sheet spring metal, out of which the cross bar is made with a portion cut away between the pair of lugs, and the lugs 16, projecting horizontally inward from that portion of the cylinder wall 10 below the bottom 11, are conveniently formed by properly slitting the projecting cylinder wall and turning the pieces inward into said horizontal position.

In the modification shown in Fig. 5, Temploy a ball valve 17 to control the air discharge passage 18 in the bottom 11 of the pump cylinder 10, and which bottom is similair to that shown in the main views, with the exception that the mouth flange of the passage 18 projects upward into the cylinder 10, instead of outward, so that the upper part of the ball valve 17 will seat itself directly in said passage 18.

' The spring cross bar 19, employed in the modification shown in Fig. 5, is also similar to the oneshown in the main views and there marked with the numeral 14:, with the exception that it is made concave at its center to receive and hold the ball valve 17; The action of this modified valve mechanism, shown in Fig. 5, is substantially the same as that of the valve mechanism, shown in the main view. 7

The pump plunger is of the customary form with its head 20 working in the cylinder l0 and its stem- 21 projecting outward through a screw cap 22, adapted to engage with an interior thread (not shown) on the filling nipple or neck 23 of thereceptacle 6,

with a gasket 24 between the same to insure an air-tight joint between the pump cylinder 10 and the receptacle 6. The stem 21 of the pump plunger worksthrough the screw cap 22 with a sufficiently loose joint to permit the inlet of the air into the top of the pump cylinder 10. Hence, on the upward stroke of the pump plunger, air will be forced into the pump cylinder below the head 20 of the pump plunger; and, on the downward stroke of theplunger, the air will be forced out through the discharge passage in the bottom 11 of the cylinder 10 and into the interior of the receptacle 6, the valve of the pump moving downward and outward under the ressure to permitthis discharge of the air.

ence, under the repeated strokes of the pump, air under pressure will be accumulated in the upper portion of the receptacle 6, above the poisonous liquid therein, and will become available to force out this mixture, whenever the spraying valve 9 is made to assume its open or spraying position.

The practicability and utility of my im-' proved air-charging. pump for sprayers has been demonstrated by the successful commercial usage thereof.

What I claim is:

1. The combination with a pump cylinder 7 having a central port in its head, of a spring bar extended diametrically of said cylinder adjacent to said port, and at its ends having interlocking engagement with said cylinder by springing lateral and axial movement, and a valve interposed between said spring bar and port and putting said spring bar under such. strain that its ends will be held interlocked between said cylinder, and said spring bar will normally hold said valve in a port closing position.

v2. In an air pump, the combination with a pump cylinderhaving a head set inward of its end and provided with a central port, of a spring cross bar arranged tobe detachably interlocked with said cylinder at a point outward of the cylinder head by lateral movement axially of the cylinder, and a valve interposed between said cross bar and air passage, said valve being normally held in a port closing position by the spring tension of said bar and the said valve putting said spring bar under such strain that it will be held detachably interlocked to said cylinder. 1

3. lnan air pump, the combination with a pump cylinder having its bottom set inward of its lower end and provided with a central air discharge passage, a valve for controlling. said passage, a spring cross bar detach-ably carrying said valve and'normally holding the same in its closed position, and cooperating lugs on the said cross bar and cylinder wall engageable and disengageable by springing the ends of the cross bar, substantially as described. a

a. in an air pump, the combination with a pump cylinderhaving its bottom set inward of its lower end and provided with a central air discharge passage, a valve for controlling said passage, a spring cross bar to the central upper surface of which said valve is ,securedand under the tension of which the valve is held in its closed position, and interlocking lugs, two of whichproject downward from each end of said cross bar and are spaced apart from each other and one of which projects inward horizontally from the wall of the cylinder at diametrically opposite points and which lugs are 100 adapted to be. en aged and disengaged by springing the ends of the cross bar lengthwise of the cylinder when the lugs are in. registration with each otherand which cross bar and valve is detachable from the cylin- 105 der by first disengaging the lugs and then swinging the bar in a rotary direction until the lugs are out of registration, substantially asdescribedr j 5. An air pump structure having in com- 110 bmation a cylinder having a centrally apertured bottom near one end thereof, the end of the cylinder beingbent inwardly at opposite sides to form inwardly projecting lugs, a resilient cross bar extending across the 115 cylinder beneath and adjacent the bottom thereof, engaging said lugs and'supporting a valve cooperating with the aperture in the cylinder bottom.

In testimony whereof I afiix my signature. 120

HENRY E. BRANDT. 

